co vs bu I´d prefer going with my hand if I 4-bet that spot and put in 27,6% of my stack
If he has there AA/KK it is cooler, but he may also play that way AK to get more fold equity or trying to make some kind of crazy bluff
So after his 5-bet prefer shoving or other option would be call and then shove on any flop (although that would likely be the best idea if you have some fold equity)